plot_estimates_pngs: Estimate PNGs
In bcgov/cccharts: Plot Climate Change Indicator Trends for British Columbia

Generates plots of climate indicator data as png files.

plot_estimates_pngs(data = cccharts::precipitation, x = NULL,
  by = "Indicator", facet = NULL, nrow = NULL, geom = "point",
  width = 350L, height = 350L, ask = TRUE, dir = NULL, ylimits = NULL,
  climits = NULL, low = getOption("cccharts.low"),
  mid = getOption("cccharts.mid"), high = getOption("cccharts.high"),
  insig = NULL, ybreaks = waiver(), xbreaks = waiver(),
  ylab = ylab_estimates, prefix = "")

`data`	A data frame of the data to plot
`x`	A string of the column to plot on the x-axis.
`by`	A character vector of the factors to separate plots by.
`facet`	A string indicating the factor to facet wrap by.
`nrow`	A count of the number of rows when facet wrapping.
`geom`	A string of the geom ("point" or "bar")
`width`	A count of the png width in pixels.
`height`	A count of the png height in pixels.
`ask`	A flag indicating whether to ask before creating the directory
`dir`	A string of the directory to store the results in.
`ylimits`	A numeric vector of length two providing limits of the y-axis scale.
`climits`	A character vector of length two providing limits of the color scale.
`low`	A string specifying the color for negative values.
`mid`	A string specifying the color for no change.
`high`	A string specifying the color for positive values.
`insig`	A string specifying the color for insignificant estimates.
`ybreaks`	A numeric vector of y-axis tick mark positions.
`xbreaks`	A numeric vector of x-axis tick mark positions.
`ylab`	A function that takes the data and returns a string for the y-axis label.
`prefix`	A string specifying the prefix for file names.